关键词: 四合木种群, 生殖值, 生殖分配

Abstract:

In this paper,the reproductive value and reproductive allocation of Tetraena mongolica were studied.The results showed that the curve of reproductive value (V_x) with increasing age tended to be low-high-low pattern.The change pattern of V_x in the age of 3～9,10～21,and older than 21 years was in the state of slow increase,rapid increase,and slow decrease respectively.The reproductive value was controlled by both the selective pressure of environment (K_x) and its own survival rate (L_x).The reproductive allocation value (RA) changed with the reproductive phase of T.Mongolica.RA decreased from the stage of flowering to frutiting.RA value increased with the age in the period of 4～21 years and decreased after 21 years.According to the relationship between reproductive age and reproductive allocation,the reproductive phase of the population could be divided into 4 stages:initial (less than 9 years old),increment (from 9～12 years old),peak (13～27 years old),and decline reproductive phase (older than 27 years old).

Key words: Tetraena mongolica, Reproductive value, Reproductive allocation